Which choice is better for generating equals() and hashCode() methods in Hibernate?

I create equals() and hashCode() methods in each Hibernate entity (if there is no inheritance) in my Java app. However, I am a little bit confused and wanted to be sure if I define it properly. Could you please clarify the following issues?

1. In IntelliJ, when I use the “Generate” feature (via Alt + Insert), there are some templates like IntelliJ Default, Java 7+, etc. Which template should I use?

2. When using the “Generate” feature, which field should I include in my equals() and hashCode() methods of the following entity?

   @Entity
   public class User {
   
       @Id
       @GeneratedValue(strategy = GenerationType.AUTO)
       private Long id;
   
       private String name;
   
       @Column(unique = true)
       private String email;
   
       // getter, setter, constructor...
   }
   

3. Should I use annotation for simple and easy usage like @EqualsAndHashCode? Or is it not flexible and should I prefer implementing explicitly?

Answer

Use the option that generates fewer code and no need 3rd party libraries. I prefer Java7+. Include just the primary key field because the important thing is to verify if 2 differents instances are representing the same row in database. There’s no need to verify if all field values are the same.

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